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@juvyjabian, I do not suggest you to try mining. As I show you in the article it is not profitable at all. You will not do any money doing mining.
For Antminer S9 at current prices of bitcoin you will never a positive income.
If you can invest 1-2 million dollars you could find a way!

Oh too bad. Im planning to buy 5 S3 at the end of the year which according to the seller, its ROI is 1 yr. You mean its not true?

You are going to buy 5 S3 from BITMAIN or second hand?
The profitability depends mainly on the sell price, if you provide me the price I can quickly check for you...

Its a second hand actually, less than a thousand dollar.